What is 3/5 + 4/7?

Here's how you add

3

5

&plus;

4

7

Step 1

Can you add yet? Nope! The denominators don't match. We need a common denominator. So next we take both denominators and multiply them. Next, take each numerator and multiply it by the denominator of the other term.

So, we multiply 3 by 7, and get 21, then we multiply 5 by 7 and get 35.

Now for the second term. You multiply 4 by 5, and get 20, then multiply 5 by 7 and get 35.